The difference between a two- digit number and the number obtained by interchanging the position of its digits is 36.What is the difference between the two digits of that number?
Correct Answer: 4
Explanation:
Let the ten's digits be x and unit's digit be y.
Then,(10x + y) - (10y + x)=36 ⇔9(x-y)=36 ⇔ x - y=4
